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=S=> BGB 557b. 1 The parties to the contract may agree in writing that the rent is to be determined by means of the price index for the cost of living of all private households in Germany computed by the Federal Statistics Office [ Statistisches Bundesamt ] ( indexed rent ) .
=S=> BGB 557b. 2 While an indexed rent is applicable , the rent , except for increases under sections 559 to 560 , must remain unchanged for at least one year at a time . An increase under section 559 may only be demanded to the extent that the lessor has carried out structural measures due to circumstances for which he is not responsible . An increase under section 558 is excluded .
=S=> BGB 557b. 3 A change in rent under subsection ( 1 ) must be made by declaration in text form . In this declaration , the change in the price index that has occurred as well as the rent in the individual case or the increase must be indicated as a monetary amount . The revised rent must be paid at the commencement of the second month beginning after receipt of the declaration .
=S=> BGB 557b. 4 A deviating agreement to the disadvantage of the lessee is ineffective .
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